Water Plant Communities in Eastern Lower Saxony (II.)

Weber-Oldecop, Dieter Wilhelm

doi:10.1002/iroh.19710560105

Cited by 10 publications

(4 citation statements)

References 40 publications

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“…The cover values of all macrophyte species that rooted in the river bed below the water level were recorded. In addition, several environmental parameters were recorded, notably the width and depth of the water body, flow velocity (determined in the stream line with the drift method as it had been used by Weber-Oldecop, 1969) and the sediment type within the plot.…”

Section: Sampling Design and Field Methodsmentioning

confidence: 99%

“…We analysed data sets from three different periods (A: 1936-1969, B: 1983-1986, C: 2010/2011). Set A, referred to as the 1950s data, contains 338 relevés from the literature (Roll, 1939;Weber-Oldecop, 1969) and from the Reinhold-Tüxen-Archive in Hannover (Hoppe, 2005). The relevés deposited in the Tüxen archive were mostly taken by Rudolph Alpers in 1946.…”

Section: Data Basismentioning

confidence: 99%

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Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Steffen

Becker

Herr³

et al. 2013

Hydrobiologia

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This resampling study in 338 semi-permanent plots analyses changes in river macrophyte diversity in 70 water courses (small streams to medium-sized rivers) from four regions of the northwest German lowlands during the last six decades. The total macrophyte species pool decreased between the 1950s and 2010/2011 by 28% (from 51 to 37 species), mean plot-level species richness by 19% (from 4.7 to 3.8 species per relevé) and the number of red-listed species by 40% (from 30 to 18 species). Species loss was associated with marked change in species traits: species with presumably higher mechanical stress tolerance (indicated by low specific leaf area and short leaf longevity) are more abundant today. Nearly, half of the species present in the 1950s had either disappeared or been replaced by other species in the recent relevés. The dramatic impoverishment is likely a consequence of continued nutrient input that drove oligo-and mesotraphent species to extinction, and of restructuring and maintenance works in the water courses that reduced stagnant and undisturbed river habitats, where stress-intolerant species can persist. Efficient measures to reduce the nutrient load and to re-naturalise stream and river beds are urgently needed to halt and reverse the loss of macrophyte diversity.

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Section: Sampling Design and Field Methodsmentioning

confidence: 99%

Section: Data Basismentioning

confidence: 99%

Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Steffen

Becker

Herr³

et al. 2013

Hydrobiologia

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“…Grube (1975) reported dense macrophyte communities from that river. Herr et al (1989b) no longer found the species-rich macrophyte communities in the river Oker, which had been described by Weber-Oldecop (1969). Artificial creation of new sites suitable for macrophyte growth also occurs, but is a negligible process compared to the destructions listed above.…”

Section: Changes In the Environmentmentioning

confidence: 98%

Human impact on the ecological performance of Potamogeton species in northwestern Germany

Wiegleb

Brux²,

Herr³

1991

Vegetatio

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The changes in habitat quality of lowland rivers in Lower Saxony (Germany) during the past 40 years are outlined. Almost all chemical, physical, and morphological parameters have changed, resulting in most cases in an enhanced potential productivity, accompanied by a complex disturbance regime. Historical reconstruction of the change in river vegetation is presented to compare the frequency of macrophyte species 40 years ago with the situation of today. For a total of 289 sampling sites, the floristic change was exactly reconstructed. Nearly all species show a decline in frequency. This trend is also recognizable in Potamogeton, with the exception of two narrow-leaved species.An attempt is made to explain both decline and maintenance in terms of life history characters (vital attributes) allowing the species to react to the changing habitat conditions. The successful species are characterized by certain life history characteristics which enable them to survive under the current disturbance regime. Most important aspects of life history are the ability to reproduce by means ofturions and other fragments, a long-lived, deep-rooting rhizome system, phenotypic plasticity of above-ground parts, synchronous shoot polymorphism, and the potential to regenerate quickly from remaining buds after disturbance. The decline of formerly frequent species can be attributed mainly to the lack of certain key characters; however, physiological characters also may be important. The extirpation of some rare species could also be caused by random fluctuations in small populations. The general importance of population ecological research, particularly demography, life history theory, and the modelling of clonal populations in conservation ecology is stressed.

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“…In the section with much more gravel as substrates, crowfoots were the main species. This is the expected vegetation (WEBER-OLDECOP, 1971;DETHIOUX and NOIRFALISE, 1985;WIEGLEB and HERR, 1985;HAURY et al, 1994;. However, site 2 was characterised by an impoverished flora.…”

Section: Floristic Richness and Biological Quality According To An Upmentioning

confidence: 71%

Aquatic Macrophyte Approach to Assess the Impact of Disturbances on the Diversity of the Ecosystem and on River Quality

Thiébaut¹

2006

International Review of Hydrobiology

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Disturbance has long been recognized as an important determinant of community characteristics in aquatic systems. The aims of our study were to evaluate the impact of different disturbances on the macrophyte diversity and on river quality. To this end, we investigated the floristic composition for different stretches impacted by disturbances and we tested both diversity indices and the trophic index (IBMR) "Biological Index Macrophytes in Rivers" in the Moselle river (NE of France). The river was divided into four sections of different lengths based on uniformity of morphological characteristics, substrate conditions and flowing velocity: the upper, the wild, the resectioned and the downstream Moselle. Floristic composition and water chemical parameters were analysed from 1999 to 2001. The man-made increase of nutrient concentration favoured the floristic richness in the last sites of the upper Moselle, whereas river dynamics and floods did not allow the development of vegetation in the wild Moselle. Disturbances caused by industrial sewage and eutrophication allowed the spreading of pollu-tolerant and riparian alien species. The aquatic macrophyte approach is a useful means to detect impact of disturbances on diversity and on river quality. However, it was not effective in assessing disturbances such as flood overflow or chemical pollution.

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Water Plant Communities in Eastern Lower Saxony (II.)

Cited by 10 publications

References 40 publications

Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Human impact on the ecological performance of Potamogeton species in northwestern Germany

Aquatic Macrophyte Approach to Assess the Impact of Disturbances on the Diversity of the Ecosystem and on River Quality

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